Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.
1996-1999 Chevrolet 454/502 GEN VI Big Block
Documents
Attributes
Camshaft Series: | Thumpr |
Usage: | Street/Strip |
Cam Type: | Hydraulic Roller |
Grind Number: | 299THR7 |
Basic Operating RPM Range: | 2,500-6,200 R3 |
Intake Duration at .050 Inch Lift: | 243 DD |
Exhaust Duration at .050 inch Lift: | 257 DD |
Advertised Intake Duration: | 299 DD |
Advertised Exhaust Duration: | 319 DD |
Lobe Separation: | 107 DD |
Intake Valve Lift: | 0.569 IN |
Exhaust Valve Lift: | 0.554 IN |
Valve Springs Required: | Yes |
Camshaft Gear Attachment: | 3-Bolt |
Camshaft Material: | Austempered Ductile Iron |
Engine Family: | Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999) |
Cam and Lifter Kit Upgrade: | CL01-602-8 |
California Proposition 65: | WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
K-Kit Upgrade: | K01-602-8 |
Lifter Type: | Hydraulic Roller |
Title: | Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI |
Amazon ASIN: | B005H89P7O |
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: | Yes, but must be a race/competition only vehicle. |
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: | Yes, but must meet tailpipe emission standards for year of vehicle. |
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: | Yes, but must meet tailpipe emission standards for year of vehicle. |
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: | Yes, but must meet tailpipe emission standards for year of vehicle. |
C.A.R.B. Exemption Reason: | N/A |
C.A.R.B. E.O. Number: | N/A |
Package Information
Orderable Status:YesQuantity:1Package UOM:Smallest Pack (Consumer Level)Package Level GTIN:00036584211952Package Bar Code:036584211952Weight Variance:0.000000000Stacking Factor:0Inner Quantity:1 Each
Extended Information
Core Return Days to Expiry:0Country of Origin (Primary):USEmission Code:Not in CAHarmonized Tariff Code (HTS):8409914000Harmonized Tariff Code (Schedule B):8409914000Life Cycle Status Code:Available to OrderLife Cycle Status Description:Available to OrderMSDS Required Flag:NoMSDS Sheet Number:N/ANAFTA Preference Criterion Code:Criteria BNational Popularity Code:Next 20% of Product Group Sales Value National Popularity Description:Next 20% of Product Group Sales ValueOEM’s Part Number:NOriginal Equipment Manufacturer:NOriginal Supplier:NOriginal Supplier Part Number:NPart Number – Old:N/APart Number Superseded To:N/ARefurbished Part:NoRemanufactured Part:NoStock Status:Shelf StockTaxable:YesWarranty Time:12Warranty Time UOM:Month